Re: Sprint Booster or ECU reprogramming
The sprint booster just speeds up the rate that the throttle body butterflies open. No gain in actual power.
The ECU upgrade changes engine parameters, i.e. increased horsepower and torque.
I have a Manual transmission, therefore the sprint booster is of little use to me. People with automatic transmissions say it makes quite a difference in the "lag" or slight delay in throttle tip-in.
The option is up to you!